iproute2 -- help

[debian@email.co.cr]

Hi.

I have a 256k ADSL that I want to split into 2 channels of 128k. One for Office 
and the other for databases.

I have read the Adv-Routing-HOWTO-8.html -- http://www.linuxdoc.org/HOWTO/Adv-
Routing-HOWTO-8.html

They make the test with 10Mbit, but a just want to use 256K for my test. Where 
cant I find all the number that I have to use. 

Is there any other alternatives to do this? Control or limit the bandwidth for 
especific computers on the say local network.

The Debian box, is the NAT !!  and I want something like this...

Internet ---- ASDL 256k --- eth1 Linux Router eth0 --| 128k--- Office computers
                                                     |
                                                     | 128k---  Database   




Thanks to all...
And, Sorry for my English....